Platform for derricks and the like.



Y J. W. PAGE.

PLATFORM FOR DEBBIOKG AND THE LIKE.

LPPLIOATIO! nun 107.16, 1010.

4 SHEETS-BEES! 1.

' ONJIII|A Julklllml CO-R WARIINCI'DN. D. C.

J. w. PAGE. PLATFORM FOB DBBRIOKB AND THE LIKE APPLIOATIOI FILED IOV.10, 1910. I

Patented Aug. 22, 1911.

4 SHEETS-BEBE! 2.

J. w. PAGE. PLATFORM FOR DEBRIGKS AND THE LIKE.

APPLICATION FILED HOV. 16, 1910.

1,001,299. PatentedAug.22, l911.

4 IHEETHHEET 3.

:cnuunu ml" in, lulllm, II- C- J. W. PAGE.

PLATFORM FOB DERBIGKS AND THE LIKE.

APPLIUATIOI nun 1011.16, 1010.

1,001,299. Patented Au 22. 1911.

4 SHEETS-SHEET 4.

JOHN W. PAGE, OF CHICAGO, ILLINOIS.

PLATFORM FOR DERRICKS AND THE LIKE.

Specification of Letters Patent.

Patented Aug. 22, 1911.

Application filed November 16, 1910. Serial No. 592,631.

8 To all whom it may concern:

Be it known that 1, JOHN WV. PAGE, a citizen of the United States,residing at Chi: cago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Platforms for Derricks and theLike, of which the following is a speclfication.

Figure l is a vertical section on the line 1. of Fig. 2; Fig. 2 is arear elevation of the device; Fig. 3 is a top plan of the device andFig.4L a top plan of the platform track and parts beneath the track.

Referring to the drawings, A is a transversely extending track composedof two jmrallel rails. Beneath the track A are two skids B and B each ofwhich is pivotally securedto the track A. through the medium of theusual turntable mechanism commonly employed in rotatable derrickplatforms and sil'nilar devices. Longitudinally movable upon the track A(that is movable in a direction transverse of the apparatus) is a lowerturntable member C, anti -friction rollers 0 being journaled in thelower turntable member O and rumiing upon the rails of the track A.Rotatably mounted on the lower turntable member C is the derrickplatform proper D, the pivotal connection between the lower turntablemember and the derrick platform proper being of the usual fori'n and anycommon mechanism being provided whereby the platform proper may berotated. The center pivot of the derrick platform proper is centrallyperforated and upon the platform proper is mounted a rotatable drum Eabout which a cable makes several turns. In practice there may be twocables so wound that if one is taken up the other is reeled out at thesame speed, or there may simply be one cable making several turns aboutthe drum. For purposes of clearness of description the two cables whichleave the drum will de designated by the reference letters F and Falthough it will be understood that these may be a continuous length.The two cables F and F pass over suitable guide-sheaves and downcentrally through the pivot between theplatfoi'm proper D and the lowerturntable member C. v The cablesthen turn in opposite directions (Fig.4) the cable F passing through the corresponding end of the platformtrack A, over two guidesheaves f, f thereon, then over a guide f at therear end of the skid B, the extreme end of this cable being attached totheforward end of the skid B The cable F is led in a symmetrical mannerto the opposite end of the platform track, over two guidesheaves f 7thereon, then over a sheave f at the rear end of the skid B and thenback to the forward end of the skid B. In other words, each cable passesdown from the drum through the center of the turntable member, thenceout to the corresponding end of the platform track, thence. over asheave on the opposite skid at the rear there of and thence to the frontof the corresponding skid.

The forward and the rear ends of the two skids are linked together bylinks G so that they always maintain a parallel relation to each other.

The operation of the device is as follows: Under normal conditions theplatform proper and the turntable member are located in the positionsshown in Fig. 2, where their weight is carried equally by the two skids.When it is desired to move the derrick along the ground one of thecables, for example, the cable F is tightened and the opposite cable,say the cable F is payed out. The first result of this movement is thatthe lower turntable member runs along the platform track A to the endthereof, the tension on the cable producing this result. Stops H areprovided to limit the movement in this direction and when the lowerturntable member reaches these stops further tighten ing of the cable Fand corresponding loosening of the cable F 1 will shorten the bightbetween the pulley f and the extreme end of said cable F thereby puttinga forward diagonal tension on the sheave f and at the same timecorrespondingly releasing the tension on the sheave F. The result willbe that the skid B will be forced forward relative to the skid B to theposition shown in Fig. 4, the derrick platform proper turning with theplatform track and the platform track turning about its pivot on theskid B. When the skid B has gone forward as far as possible the rotationof the drum E is reversed so that the cable F is tightened up and thecable F payed out. As a result the derrick platform slides to theopposite end of the platform track, thus relieving the skid B of itsweight so that it In this way the platform can be made to walk forwardstep by step to an indefinite extent.

may be moved.

When it is desired to turn a corner the links which hold the skids inparallel position can be removed and one skid after the other turned inthe desired direction so that a ver sharp turn can be made. When it isdesired to turn only a very gradual curve, the links which connect theskids can be varied in length through the medium of turn-buckles thereininterposed, and the direction of movement thus gradually varied. It willbe understood that the movement of a derrick of this character may befor two different purposes. The first is for the purpose of moving thederrick bodily for a considerable distance at a relatively high speed sothat its movement may be accomplished without dismantling it. It canreadily be moved at a speed of about a mile a day. Another and much moreimportant purpose of moving the derrick is that of causing it to travelslowly in the line of a fixed cut or other excavation which is beingmade by an excavator of usual form operated by the derrick. For thispurpose the derrick will remain in one position until the excavator hasdone its work. It will then have to be moved forward only a few feetwhich can readily be accomplished. The steps of the derrick will undersuch circumstances occur only about once in'fifteen or twenty minutes.

While the foregoing construction is particularly designed for use inconnection with derrick platforms, it is possible that the same type ofmovement might be desirable in connection with other devices, and it isnot therefore, intended to limit the application of the invention toderrick platforms alone. It is also realized that considerablevariations are possible in the details of the construction herein setforth, and it is not intended to limit the scope of the inventionthereto except as pointed out in the following claims.

What I regard as new and desire to secure by Letters Patent is 1. Thecombination with a track extending generally transversely of the line oftravel. of the device, of a platform movable thereon, means for movingthe platform from end to end of the track and means for moving forwardthe opposite end of the track from that on which the platform rests atany given time.

2. The combination with a track extending generally transversely to theline of travel of the device and two supports to relieve the track andpivoted thereto of a platform movable upon the track and means formoving the platform from end to end of the track to relieve each pivotedsupport of its weight alternately and means for shifting forward thesupport opposite to the platforms position at any given time.

3. The combination with a track extending generally transversely of theline of travel of the device and two supports below the track andpivoted thereto, of means for holding the supports in parallel relationwith each other, a platform movable on the track, means for moving theplatform from end to end of the track to relieve each pivoted support ofits weight and means for shifting forward the support opposite to theplatform at any given time.

4. The combination with a trackextending transversely of the generalline of travel of the device a platform movable thereon from end to endand a single device for first moving the platform to one end of thetrack and then shifting the other end forward in the line of travel.

5. The combination with a track extending transversely of the generalline of travel of the device of two skids pivoted thereto, a platformmov ble on the track and a pair of cables operable from the platform andeach led over one end of the track then to the rear of the opposite skidand then to the front of the adjacent skid, for the purpose set forth.

6. The combination with a track extending generally transversely of theline of travel of the device, two skids pivoted thereto to support theframe, a platform movable on the track and a pair of cables operablefrom the platform each engaging a skid at its rear and having a forwardattachment whereby the skids may be alternately moved forward.

7. The combination with a track extending generally transversely of theline of travel of the device, two skids pivoted thereto to support thesame, a platform movable on the track and a pair of cables operable fromthe platform each engaging a skid at its rear and having a forwardattachment where by the skids may be alternately moved forward, eachcable also engaging the opposite end of the track from the skid which itengages whereby the platform may be moved thereon to relieve the skid ofits weight.

JOHN W. PAGE. t

In presence of R. A. SGHAEFER, JOHN WILSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

